In worlds created prior to 1.17.40 (as of my testing) and or updated to the Non-Preview (1.21.30 currently) changes parts of the Nether Biomes to an Overworld Biome (most likely Ocean) upon reloading for a second time wiping out the Nether Biome data in some chunks.
Steps to reproduce:
Import the provided test world into 1.21.40.23 Preview and load
Observe the Nether Biomes are expected
[media]Enter the portal and come back or Exit the world and rejoin it
The Nether Biomes switched to an Overworld Biome and the fog is gone
[media]
The Overworld and End dimensions are also affected by this issue.
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This is somehow related to world with custom biomes enabled. I enabled it without knowing what kind of feature was that back in 2020 (prob around nether update 1.16.100). Mine had one and now wipes off biome data every time I reload my world ever since I upgraded to version 1.21.40.x.
I am stuck playing with v1.21.30.x for stability.
Edit: It also appears to be an intentional world-breaking feature. I hope this will be reverted as it destroyed my world biomes.
https://feedback.minecraft.net/hc/en-us/articles/30556182663437-Minecraft-Beta-Preview-1-21-40-23
migrated
This is somehow related to world with custom biomes enabled. I enabled it without knowing what kind of feature was that back in 2020 (prob around nether update 1.16.100). Mine had one and now wipes off biome data every time I reload my world ever since I upgraded to version 1.21.40.x.
I am stuck playing with v1.21.30.x for stability.
Edit: It also appears to be an intentional world-breaking feature. I hope this will be reverted as it destroyed my world biomes.
https://feedback.minecraft.net/hc/en-us/articles/30556182663437-Minecraft-Beta-Preview-1-21-40-23
Wafity
yay, it is fixed